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Damping Capacity Investigation of some Copper based alloys through Thermal Analysis PhD student Nicanor Cimpoesu Faculty S.I.M. Iai
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Contents Damping capacity Materials with big internal friction and applications Investigated alloys characterization - spectrometer - spectrometer - D.I.L. - D.I.L. - D.S.C. - D.S.C. - optical micrographs - optical micrographs - S.E.M. and E.D.X. - S.E.M. and E.D.X. - D.M.A - D.M.A Conclusions
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Damping capacity
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Materials with damping capacity Rubber membrane with 0.8 value of internal friction Steel sample with internal friction 0.005 1 Hz frequency. Adhesive with low viscosity with 6 the value of internal friction at –20 °C temperature. A quartz with 0.2 and a shape memory alloy TiNiCu with 0.12
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Shape memory alloys applications as materials with damping capacity
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Analiza chimica a AMF urilor
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Dilatometry tests
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Differential Scanning Calorimetry (DSC) of studied alloys
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Optical micrographs Optical micrographs
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Scanning electron micrographs (SEM) Scanning electron micrographs (SEM)
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EDAX study of investigated alloys
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Studiu EDX a aliajelor investigate Part. III
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Damping capacity investigation with a DMA (dynamic mechanical analyzer) equipment
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Frecarea interna a unui aliaj cu memoria formei tip CuZnAl
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Applications of S.M.A.-s with big internal friction and shape memory effect
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Conclusions Conclusions Two alloys from copper-zinc system was obtain in classical conditions, and after investigation with a differential dilatometer reveals nice shape memory effect. Using combined equipments we can analyze and conclude on thermal behavior at heating and cooling of a shape memory alloy like transformation points, damping capacity and elastic modulus variation with temperature. Small value of internal friction at room temperature of a shape memory alloy can’t be used in energy dissipation applications. Contrarily the same Cu-Zn-Al SMA presents a nice peak of internal friction around temperature of 90 ºC, in transformation points range, of 0,116 which can be use for practical applications.
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Paper was sustain by PCE-IDEI grant 616, project 83/01.10.2007 Thanks: Thanks: - Prof. Dr. Ing. Hopulele Ion - Conf. Dr. Ing. Stanciu Sergiu THE END
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